Brainstorming is a technique that allows the collection of the maximum number of ideas on a subject from a group without considering the validity or practicality of the ideas. The purpose of brainstorming is to generate as many ideas as possible in a short time, without judging or evaluating them. The ideas can be later prioritized, categorized, or refined by using other techniques. Interviewing is a technique that involves asking questions to individuals or groups to elicit information, opinions, or feedback. Prototyping is a technique that involves creating a model or a representation of a solution or a part of it to validate requirements, assumptions, or concepts. Surveying is a technique that involves collecting data from a large number of respondents using predefined questions and formats. References: Business Analysis for Practitioners: A Practice Guide, page 71-72; PMI Professional in Business Analysis (PMI-PBA)® Examination Content Outline, page 15.